Fix deeply (5)
I believe the answer is:
embed
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">fix deeply</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for embed that I've seen before include "Fix fast in something solid" , "Fix securely" , "Implant (eg, an idea)" , "Fix firmly and deeply" , "bringing plant inside" .)